/// Template path: /home/mohammed/.config/sublime-text-3/Packages/User

#include <bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>
using namespace std;
using namespace __gnu_pbds;

// typedef
typedef long long ll;
typedef long double ld;
typedef vector<int> vecint;
typedef vector<char> vecchar;
typedef vector<string> vecstr;
typedef vector<long long> vecll;
typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;

// Marcos
#define endl ("\n")
#define int long long
#define mod 1000000007
#define pi (3.141592653589)
#define REP(i,a,b) for (int i = a; i < b; i++)
#define RREP(i,a,b) for (int i = a; i > b; i--)
#define fast ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr)

// Functions
long long squared(long long x) {return (x * x) % mod;}
int factorial(int n) {long long res = 1; for (int i = 1; i <= n; i++) {res = ((res * i) % mod + mod) % mod ;} return res;}
long long power(long long x, long long p) {if (p == 0) {return 1;} if (p % 2 == 1) {return (power(x, p - 1) * x) % mod;} return squared(power(x, p / 2));}

// cout << fixed;
// cout << setprecision(4);


// ---------(^_^)--------- //




void main_solve() {


	int n; cin >> n;
	vector<int> X;
	vector<int> L;

	for (int i = 0 ; i < n ; i ++) {
		int x;	cin >> x;
		X.push_back(x);
	}

	for (int i = 0 ; i < n ; i ++) {
		int x;	cin >> x;
		L.push_back(x + X[i]);
	}

	vector<vector<int>> v;

	for (int i = 0 ; i < n ; i ++) {
		v.push_back({L[i], X[i]});
	}
	sort(v.begin(), v.end());
	int result = 0;
	int curr = 0;
	multiset<int> s;
	for (int i = 0 ; i < n ; i ++) {
		// cout << v[i][0] << ' ' << v[i][1] << endl;
		if (curr > v[i][0] - v[i][1]) {
			auto it  = s.end();
			it--;
			if (v[i][1] < *it) {
				curr -= *it;
				curr += v[i][1];
				s.erase(it);
			}



			continue;
		}
		s.insert(v[i][1]);
		curr += v[i][1];
		result++;

	}
	cout << result << endl;
}


int32_t main() {

	fast;
// #ifndef ONLINE_JUDGE
// 	freopen("input.txt", "r", stdin);
// 	freopen("output.txt", "w", stdout);
// #endif
	// Just another problem (-_-)

	int t;
	t = 1;
	// cin >> t;

	while (t--) {
		main_solve();
	}


}